<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
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  <title>Document</title>
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<body>
  <script>
     function makeMultiplier(id) {
        const num = id
        function fn(a) {
          return num *a
        }
        return fn
      }
      const multiplyByThree = makeMultiplier(3)
      console.log(multiplyByThree(5))
      console.log(multiplyByThree(10))
  </script>
</body>
</html>